U55

The U55 is a U-Bahn line that covers 3 stations and is currently 1.8 km. This line operates as an independent line although work is currently underway to connect it with the U5. Because the U55 line is not connected to the rest of the Berlin U-Bahn system, trains must be lowered into the tunnel from street level. The U55 is expected to be connected to the U5 in 2017.